The Voices Recordings: Listen in to the diverse voices of the United Kingdom, Channel Islands and Isle of Man – from Shetland to Penzance. Eavesdrop on Rotarians in Pitlochry and Travellers in Belfast. Drop in on skateboarders in Milton Keynes. Overhear pigeon fanciers in Durham.
The clips are drawn from the Voices recordings – which capture 1,200 people in conversation. Some of the clips are people talking about language – slang, dialect, taboo words, accents. Other clips cover all sorts of subjects and simply offer a flavour of how we talk today.
http://www.bbc.co.uk/voices/recordings/

London: http://www.bbc.co.uk/voices/recordings/group/london-clapham.shtml
Ireland: http://www.bbc.co.uk/voices/recordings/group/ulster-portglenone.shtml
Wales--Glynneath: http://www.bbc.co.uk/voices/recordings/group/wales-glynneath.shtml
Wales: http://www.bbc.co.uk/voices/recordings/group/cymru-pontyberem.shtml
Glasgow Scotland: http://www.bbc.co.uk/voices/recordings/group/scotland-kelvinside.shtml
York: http://www.bbc.co.uk/voices/recordings/group/york-york.shtml
London--Cockney Rhyming Slang: http://www.bbc.co.uk/voices/recordings/group/york-york.shtml
Plymouth-Devon: http://www.bbc.co.uk/voices/recordings/group/devon-plymouth.shtml
Shetland-Scots: http://www.bbc.co.uk/voices/recordings/group/scotland-whalsay.shtml

Received Pronunciation

Dialect Map of American English

IDEA--International Dialects of English Archive

22 Maps That Show How Americans Speak English Totally Differently From One Another

NY Times Dialect Quiz

http://www.uncleremus.com/stories.html